Floating projection device

Abstract

A floating projection device includes a mirror structure, an optical structure, an optical coating and a display. The optical structure covers the mirror structure, and forms an accommodating space with the mirror structure. The optical coating is disposed on the optical structure. The display is disposed in the accommodating space formed between the optical structure and the mirror structure, and is configured to transmit a plurality of image light beams to the optical structure.

What is claimed is: 
     
         1 . A floating projection device, comprising:
 a mirror structure;   an optical structure, covering the mirror structure, forms an accommodating space with the mirror structure;   an optical coating, disposed on the optical structure; and   a display, disposed in the accommodating space formed between the optical structure and the mirror structure, is configured to transmit a plurality of image light beams to the optical structure.   
     
     
         2 . The floating projection device according to  claim 1 , wherein the optical coating is disposed on an inner surface of the optical structure facing the mirror structure. 
     
     
         3 . The floating projection device according to  claim 1 , wherein the optical coating comprises a phase retardation film layer and a polarization selective reflective film layer. 
     
     
         4 . The floating projection device according to  claim 3 , wherein the polarization selective reflective film layer is disposed between the inner surface of the mirror structure and the phase retardation film layer. 
     
     
         5 . The floating projection device according to  claim 3 , wherein the image light beams are reflected a first time on an inner surface of the optical structure and generate a plurality of first reflected beams, the first reflected beams are reflected a second time on a reflective surface of the mirror structure and generate a plurality of second reflected beams, the second reflected beams transmit the inner surface of the optical structure and form a display image which is a real image. 
     
     
         6 . The floating projection device according to  claim 3 , wherein the display projects the image light beams as a circularly polarized light of a first handedness, the phase retardation film layer converts the image light beams into a linearly polarized light in a first direction, the polarization selective reflective film layer reflects the image light beams of the linearly polarized light in the first direction to generate the first reflected beams, the phase retardation film layer then converts the first reflected beams into the circularly polarized light of the first handedness. 
     
     
         7 . The floating projection device according to  claim 6 , wherein a reflective surface of the mirror structure reflects the first reflected beams to generate the second reflected beams as a circularly polarized light of a second handedness. 
     
     
         8 . The floating projection device according to  claim 7 , wherein the phase retardation film layer converts the second reflected beams into a linearly polarized light in a second direction, the polarization selective reflective film layer transmits the second reflected beams of linearly polarized light in the second direction. 
     
     
         9 . The floating projection device according to  claim 4 , wherein the display image is imaged outside the accommodating space and adjacent to an outer surface of the optical structure. 
     
     
         10 . The floating projection device according to  claim 1 , wherein the mirror structure and the optical structure have a first curvature radius and a second curvature radius respectively, and the first curvature radius and the second curvature radius are real numbers other than zero. 
     
     
         11 . The floating projection device according to  claim 10 , wherein a concave surface of the mirror structure faces a concave surface of the optical structure. 
     
     
         12 . The floating projection device according to  claim 1 , wherein one of the mirror structure and the optical structure is a planar structure, the other one of the mirror structure and the optical structure has a curvature radius which is constant, the curvature radius is a real number other than zero. 
     
     
         13 . The floating projection device according to  claim 1 , wherein the optical structure is a transparent structure.